Image processing apparatus, image processing method, and storage medium

Abstract

An image processing apparatus includes a generation unit configured to generate a first distance image having a pixel value based on a distance from an outline of a region that indicates a predetermined part of the subject and is extracted from a first image, and having a resolution lower than a resolution of the first image, and generate a second distance image having a pixel value based on a distance from an outline of a region that indicates the predetermined part and is extracted from a second image, and having a resolution lower than a resolution of the second image, a first calculation unit configured to calculate first deformation information by registering the first distance image and the second distance image, and a second calculation unit configured to calculate second deformation information by registering the first image and the second image based on the first deformation information.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of International Patent Application No. PCT / JP2019 / 049333, filed Dec. 17, 2019, which claims the benefit of Japanese Patent Application No. 2018-243767, filed Dec. 26, 2018, both of which are hereby incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to an image processing apparatus, an image processing method, and a storage medium.Background Art[0003]In the medical field, a subtraction technique for acquiring an image expressing a temporal change between images as a difference (hereinafter “difference image”) is known as a technique to be used in comparing two original images captured at different times (hereinafter “reference image” and “comparative image”).[0004]To generate a difference image in which a temporal change of an imaging target is appropriately captured in the subtraction technique, it may be desirable to a...

AI Technical Summary

Benefits of technology

The patent aims to help accurately register two images that were captured at different times, while reducing the calculation cost.

Problems solved by technology

In the technique discussed in NPL 1, however, because two types of image, i.e., the original image and the distance image based on a result of extracting a predetermined part, are simultaneously used in the registration processing, there is such an issue that the calculation cost involved in the processing is high.

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